1 /* 2 ** Copyright 2010, The Android Open-Source Project 3 ** Copyright (c) 2011, Code Aurora Forum. All rights reserved. 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #include <stdio.h> 19 #include <stdlib.h> 20 #include <string.h> 21 #include <errno.h> 22 #include <ctype.h> 23 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <fcntl.h> 27 #include <unistd.h> 28 #include <stdint.h> 29 #include <string.h> 30 31 #include "alsa_audio.h" 32 33 34 struct mixer_ctl *get_ctl(struct mixer *mixer, char *name) 35 { 36 char *p; 37 unsigned idx = 0; 38 39 if (isdigit(name[0])) 40 return mixer_get_nth_control(mixer, atoi(name) - 1); 41 42 p = strrchr(name, '#'); 43 if (p) { 44 *p++ = 0; 45 idx = atoi(p); 46 } 47 48 return mixer_get_control(mixer, name, idx); 49 } 50 51 int main(int argc, char **argv) 52 { 53 struct mixer *mixer; 54 struct mixer_ctl *ctl; 55 unsigned value; 56 int r; 57 const char* device = "/dev/snd/controlC0"; 58 59 mixer = mixer_open(device); 60 if (!mixer){ 61 fprintf(stderr,"oops: %s: %d\n", strerror(errno), __LINE__); 62 return -1; 63 } 64 65 if (argc == 1) { 66 mixer_dump(mixer); 67 mixer_close(mixer); 68 return 0; 69 } 70 71 ctl = get_ctl(mixer, argv[1]); 72 argc -= 2; 73 argv += 2; 74 75 if (!ctl) { 76 fprintf(stderr,"can't find control\n"); 77 mixer_close(mixer); 78 return -1; 79 } 80 if (argc) { 81 if (isdigit(argv[0][0])) 82 r = mixer_ctl_set_value(ctl, argc, argv); 83 else 84 r = mixer_ctl_select(ctl, argv[0]); 85 if (r) 86 fprintf(stderr,"oops: %s: %d\n", strerror(errno), __LINE__); 87 } else { 88 mixer_ctl_get(ctl, &value); 89 } 90 mixer_close(mixer); 91 return 0; 92 } 93
